Change Main Texture on Collider not Collidee

This has me stumped. I'm able to successfully change the texture of an entity, lets say for this example a cube, when my Player collides with the cube. However, I want to change the texture for my Player, not the cube. I think what is throwing me off, is that the texture is attached to a child of the overall Player entity.

Here is my code for changing the Cube's texture.

 using UnityEngine;
 using System.Collections;
 
 public class changeTex : MonoBehaviour {
     public Texture texturea;
     public Texture textureb;
     public Collider other;
     // Use this for initialization
     void Start () {
         renderer.material.mainTexture = texturea;
     }
     
    
     void OnTriggerEnter(Collider other) {
         this.other = other;
         //other.tag="Player";
         if(other.tag!="Player") {
             print ("nice try");
         } else {
             renderer.material.mainTexture = textureb;
         }
     }
 }

You can see that the Player has to have a tag of "Player" for it to work. Now, my code where instead of changing the Cube's texture, you change the Player's texture.

 using UnityEngine;
 using System.Collections;
 
 public class changeToHelmColor : MonoBehaviour {
     public Texture normTexture;
     public Texture changeTexture;
     public Collider other;
     
     // Use this for initialization
     void Start () {
         renderer.material.mainTexture = normTexture;
     }
     
     // Update is called once per frame
     void Update () {
         
     }
     
     void OnTriggerEnter(Collider other) {
         this.other = other;
         
         if(other.tag != "Helm") {
             print("Nice try");
         } else {
             renderer.material.mainTexture = changeTexture;
         }
     }
 }

From what you see, upon colliding with the cube, it will change the texture. I have selected the Cube's tag as Helm, because I want this script to change the player's helm texture.

What is happening though, is that upon loading, it immediately prints "Nice try", and doesn't update when I do collide with the cube.